How to change the Chromium/Chrome scrollbar look and apply any webkit css to it.
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Create a directory in ~/.config/google-chrome/Defaults/Extensions/scrollbartweaks and copy or symlink the files there
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Create a custom css at https://mikethedj4.github.io/Webkit-Scrollbar-Generator/ for example and replace scrollbar.css
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Load the extension manually from the Extensions page with developer mode
http://blog.szsz.pl/2009/12/chrome-extensions-tutorial-1.html I just changed the css, nothing fancy. Just lamenting the fact that there's so little info about this trick.
Some more tips on how to customize: https://css-tricks.com/custom-scrollbars-in-webkit/